Update subosito/flutter-action action to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
subosito/flutter-action	action	major	v1 -> v2

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Release Notes

subosito/flutter-action

v2

Compare Source

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Configuration

📅 Schedule: "before 10am on monday" in timezone Asia/Tokyo.

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, click this checkbox.

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[codecov]

Codecov Report

Merging #188 (99d7c1e) into main (1a1ba2c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files          19       19           
  Lines         574      574           
=======================================
  Hits          568      568           
  Misses          6        6           

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